Sheep-shear comb



sept. 7, 1926.

F. G. BRlsTow SHEEP SHEAR` 00MB 'Filed oct. so, 19.25

Patented Sept. 7, 1926.

UNITED STATES .PATE

NT OFFICE.

FRANCISS G. BRISTOW, OF SYDNEY, AUSTRALIA.

Y SHEEP-SHEAR (30MB.`

Application filed October 30, 1925.` Serial No.65,78`2.

The purpose of this invention is to provide an improved construction of comb for.

sheep shear. It consists of the elements and features of construction shown and described as indicated in the claims.

In the drawings:

Figure l is a top plan view of a sheep shear comb embodyingthis invention.

Figure 2 is a section at the line2-.2l on Figure 1,. i 4 Y Figure 3 is a detail section at the line S on Figure 2.

Figure 4 is adetail section at the line 4-4 by means of which the Shearer may readily o graduate the length ofthe stubble within desirable limits by slightly varying the angle of tilt of the shear in operation, with-y out incurring Vliability of pricking or scratching the animal by reason of the point pressing the skin at an angle too abrupt, or the liability of failure to part the wool fibre down to the skin, and thereby leave they stubble matted and uneven.

This purpose is accomplishedkby giving to the teeth, 10, ofthe comb -A,*tlieform shown, whereinthe teeth are each characterized by comprising an extension, 11, forward of the line of cnt the arc of sweep of the vibrating cutter-indicated by the curved line 12-12 on Figure 1, said extension trending slopingly down forward at approximately a 45 angle, though considerable variation each way of this angle is permissible, this slope continuing as to the upper edge, 13, of the tooth until that edge reaches a point, 13a, about as low as the plane on the back side of the comb, and in the most preferred form shown in Figures il and 2 slightly lower than that plane, the finger extending thence a short distance further with its upper edge, 1311,-in the preferred form-curved upwardly and concave rearward and upward, as seen in Figure 2. The lower edge, 14, of the fin ger is circumflex in contour, yconcave downward and rearward to such a` point as 14, and then convex downwardas at 14h, the

last mentioned curve convergingwith the. upper edge, 13,V the two edges meeting in a slightly blunted point, v15, which is .positi'oned substantially in the plane or under side ofv the comb plate.

The linger extensions, intheir horizontal dimension, are quite thin, and they are tapered in' thickness nearly to` knife-edge at the beginning of their -protrusionforward of the line of cut; and their forward terminal portion is tapered in thickness nearlyl to knife-edge at both upper and lower edges, as seen .in section in Figure 3.4

The comb tooth extensions,

outermost-at the lefthand, are all. of the same length; and they are deiiected laterally in opposite directions from the three middle teeth, fan-wisehthat is,` radiating from a common center which. may desirably be llocated-in the axis of the vibrating cutterthe center of the arc,'12-12, of the line of of the back 4the upper edge, as nearly as possible from u `except the cut. These extensions thus terminate all in an arc concentric with the are of the line It will be understood that in operation of the shear the pressure applied tofholdthe comb to the pelt causes all the teeth, includ ing` the extreme teeth atboth sides, to come in touch with the pelteven when the comb is tilted `up at the greatest angle at which it is operated for 'producing the longest stubblegand that, therefore, at any tilt of the combthe point of cutas to all vthe teeth is at the same elevation, and the stubble is therefore caused to be uniform in length over the full breadth of the comb.

The fanning of the teeth, as described, has the purpose and gives the result of gathering the wool between the comb finger extensions somewhat more compactly, vand therefore in better condition for being severed without being leaned laterally by the stroke of the cutter before actual severance occurs; by diverging all the extensions from a common center the amount of wool gathered is the same in all the tooth gaps, the slight exception in the case of the gaps between the middle tooth and the next one at each side being negligible.

The outermost tooth at the left hand side has its extension, 11X, curved outwardly and extended slightly beyond the arc .in which all the other tooth extensions terminate. This tooth, it will be understood, travels over the stubble or previously sheared area.

of the pelt; and this outwardlycurved extension is provided to insure entering under any wool filaments which may be leaning outwardly from the boundary line of'the last preceding shearing stroke sov as. to

gather such' leaning'iilaments into the first tooth gap. r

TheA form of theitooth kextensions shown in Figure 2 is the preferred form; but conv siderable variation of this form is permissible 'without departing fromfthe spirit, or sacrificing thevalue of the invention. In this form the extension is widened vertically finishing portion of this curve converges toward the uppervedge, 13b, asseen-in lhgure 2.

In' the form shown-in Figuretthe upper edge of the tooth extensionat 'the terminal portion thereof -is deflected slightly upwardly with respect tothe"initial1'slopc which extends to the point, 13, and the terminal portion ofthe extension isv bentA bodily down, rearward, vand up behind the initial slope of the extension,- forming by its edge-which being continuousI with the upper edge, becomes the lower edge by' this downwardlyrearward deflection-av curvilinearV rider, 16,* corresponding in function and service to the downwardly convex terminal portion` of the terminalv ofthe other forms. v Y

lVhile each ofthe forms shown'has for certainvsituations and conditions some advantage, andthey are both withinthe'scope of the invention, for general use andr` for A my hand this th day ofSeptember, 1925.

meeting theV widest range of conditions 'lf consider the form shown specifically in Fig` ures 2 and 5 as the preferred embodiment of my invention.- f

I claim l. A sheep sheai comb having the teeth veachextending forwardlof the line of cut,

and sloped downward in their initial for- -wardextent, the upper edge being slightly deflected upwaidlyrelative to the previous Ydownward slope' at va short distance back fi'om the terminal, and the lower edge being downwardly convex back ofthe terminal for a substantial portion ofthe lengthy of' the 'y extension.

2. A sheep shear `coinbhaving the-:teeth extending forwardly of the line of cutwith downward trend and terminating lall in a forwardlyv convex are, theiextensions being laterally' deflected approimately'- at lthe line of cut, fan-wise in opposite 'directions from the middle of the width ofthe comb.y

y 3. `A shee shear comb having :tAlie-coiiib4 teeth extent ed forward of the' line ofcut and sloped downward and forwardas to-the upper edge to a point substantially as low converging with the upper,v edge to a'blunt -as the plane atvthe ,under lside of the Vcomb plate, and as to the loweredge formed for point, the terminal portion of tlietooth 'exy tension being deflected bodilyiupward to the extent that Athe upper edgeis'upwardly and rearwardly concavefor a Irelatively? short distance lback yof thebluntpointl l v-.In the construction' 'definedginfclaimf il foregoing, theY are Tof, termination ofi: the tooth extensions bein i `substantially concentric with the arc of the line of cut, and Y the fan-wise divergence: of'said extension being such as 'to cause'the'm all'to extend;t

radiallywith lrespect tothe centerofsaid arc whereby the tiltingy ofthe: comb, wheny pressed to theskin of the animal, Icauses.` equal elevation of' th'efpointsA of 'cutof'all theteeth. H

In testimony whereof, 1. rhave hereunto set sa .Y 

